SUNSET: 
0
Photographer:
Location of Photo:
Deep Sky West, Chile
Date/Time of photo:
15 March 2021
Equipment:
Scope used and reducer: Takahashi TOA-150 Mount Used: Astrophysics 1600GTO-AE Camera Used: FLI ML16200, Astrodon Gen2E RGBSHO filters ISO/Exposure: R: 23x300s, G: 30x300, B: 23x300, SII: 13x1800, Ha: 11x1800, OIII: 14x1800. Total Exposure: 25.3 hrs
Description:
NGC 3199 lies about 12,000 light-years away, a glowing cosmic cloud (emission nebula) in the southern constellation of Carina. The nebula is about 75 light-years across ..and more or less a complete ring shape, with one much brighter edge. ... Near the center of the ring is a Wolf-Rayet star, WR-18, a massive, hot, short-lived star that generates an intense stellar wind. In fact, Wolf-Rayet stars are known to create nebulae with interesting shapes as their powerful winds sweep up surrounding interstellar material .. in a bow shock produced as the star plowed through a uniform medium. But measurements have shown the star is not really moving directly toward the bright edge. So a more likely explanation is that the material surrounding the star is not uniform, but clumped and denser near the bright edge of windblown NGC 3199. [Edited from NASA APOD write-up from 2008 and Wikipedia]:
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